Lecture 6: Graphics Pipeline (31)
bveeramani

One thing that I'm confused about is how you can just layer different types of shading on an object. Wouldn't the different types of shaders interact with each other in weird ways?

pixelled

@bveeramani According to http://www.pbr-book.org/3ed-2018/Color_and_Radiometry/Radiometry.html, we can assume light follows the behavior of linearity so that "the combined effect of two inputs to an optical system is always equal to the sum of the effects of each of the inputs individually." This explains why we can add up the results of different shaders together.

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